Mold for steel castings.



- No. 669,952. Patented Mar. I2; I90].

V W. BRINTDN.

MOLD FDR STEEL CASTINES.

(Application filed Dec. 5, 1900.)

(No Model.) 2 Sheets--Sheet l.

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No. 669,952. Patented Mar. [2, Mil.

W. BRINTUN.

MOLD FOR STEEL GASTINGS.

(Application filed Dec. 5, 1900.)

(No Model.) 2 Sheets-Sheet 2.

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NITED STATES PATENT FFICE.

WALTER BRINTON, OF HIGHBRIDGE, NEW JERSEY, ASSIGNOR TO TAYLOR IRON & STEEL COMPANY, OF SAME PLACE.

MOLD FDR STEEL CASTlNGS.

SPECIFICATION forming part of Letters Patent N 0. 669,952, dated March 12, 1901.

Application filed December 5, 1900. Serial No. 38,850. No model) To Z w fl it y OOWJWTIH zone, and Fig. is a vertical section of the Be it known that I, WALTER BRINIJON, a chill shown in Fig.

citizen of the United States, and a resident Inasmuch as my invention is particularly of Highbridge, in the county of Hunterdon adapted for casting projectiles I have here 5 and State of New Jersey, have invented an in shown the molds as constructed and ar- Improvement in Molds for Steel Castings, of ranged for such use; but it will be manifest which the following description, in connecto those skilled in the art that by suitably tion with the accompanying drawings, is a changing the shape or configuration of the specification, like letters on the drawings repmolds other articles may be cast in accordi-o resenting like parts. ance with my invention. In casting steel, and particularly steel pro- Referring to Figs. 1, 2, and 2, the chill a jectiles, it. has heretofore been the practice to of the mold is made of iron or steel and in use molds having a metallic lower portion, the present instance receives the molten steel such as iron or steel, in order to rapidly chill which is to form the point and head of the x5 the molten steel contacting with the metallic projectile, so that such parts shall be rapidly portion, the upper portion of such mold being cooled or-chilled by contact with the metal, constructed of sand or havinga sand lining, and the top of the chill is laterally enlarged, so that the molten metalin that part of the as at a, to providea firm support for the non mold will cool more gradually. When castchilling portion or member of the mold, com- 2o ing asteel projectile, for instance, in such a prising a box or flask f, havingasand lining mold, there is a great tendency to crack and e, the annular rib f" at the bottom of the set up highly-objectionable strains in that flask entering the correspondiugly-recessed portion of the projectile at the junction of the part a in the top of the chill. An internal chill and sand, such tendency being due to annular recess 0 is formed at the top of the 25 the more rapid contraction of the part of the chill, the. bottom 0 of such recess being metal cast in the metallic chill. shown as scalloped, serrated, or corrugated,

This invention has for its object the avoidthe structure being very clearly shown in Fig. anee of such defects, preventing the forma- 2", in which the upper part of the chill is tion of cracks, and the setting up of objectionshown with the sand removed.

30 able strains, and I attain such object by so In using the mold sand is filled into and constructing the mold that an intermediate repacked in usual manner in the recess 0, its top gion or zone is provided between the chill and being smoothed off to form a closed joint with the non-chilling part of the mold, so that the bottom of the sand lining e, (see Fig. 2,) the rate of cooling of the casting adjacent sothataseries of finger-likeportionsdofsand 35 thereto gradually changes from a comparaare presented. The intermediate portion of t-ivelyrapid rate at the chilled partto the relathe mold between the bottom of the nontively slower rate at the non-chilled part of chilling portion and the main part of the the casting. chill will therefore be composed of alternat- Figure 1 is a horizontal section on the line ing juxtaposed portions of sand and metal, I

0 a: as, Fig. 2, of a mold, illustratingone embodiwhich come in contact with the cast metal bement of my invention. Fig. 2 is a vertical tween the chilled and the non-chilled portions 0 sectional View thereof, the upper part of the thereof, the effect to such intermediate zone mold being broken away. Fig. 2 is a detail being to reduce the rapidity of cooling of the view similar to Fig. 1, showing the upper adjacent part of the casting, such rate de- 45 part of the chill with the sand omitted from creasing from the comparatively rapid rate the intermediate part of the'mold. Fig. 3 is at the full metallic part of the chill to the a vertical sectional View of a modification to relatively slower rate at the bottom of the be described. Fig. 4 is a top or plan View of non-chilling member of the mold, such rea modification of the chill and intermediate tardation of the cooling preventing in the casting a sudden transition from rapid to slow cooling, with the attendant formation of cracks, openings, or other defects, or the setting up of highly objectionable internal strains in the casting.

In Fig. 3 the chill g is constructed in usual manner, except that the top thereof within the annular seat g for the non-chilling body portion or flask fis scalloped, corrugated, or serrated, as at 9 (see also Fig. 5,) and the sand lining e of the body portion of the mold is carried down to and between the corrugations, as ate Fig. 3, so that alternating and juxtaposed portions of metal and sand are presented at the intermediate portion of the mold for the purpose hereinbefore set forth.

The construction of the chill is very clearly illustrated in Fig. 5.

In Fig. 4 I have shown in top or plan view a modification wherein the upper part of the Wall of the chill la is formed with internal ribs or corrugations, as 7t, extended in the takes place gradually at the intermediate portion of a mold, the rapidly-cooling portion of the casting below it and within the chill blending or grading into the more slowly cooling part in the body portion of the mold,

so that the resulting casting is free from the defects hereinbefore referred to.

Having fully described my invention, What I claim, and desire to secure by Letters Patent, is

1. A mold for producing castings, comprising a metallic portion to chill the contained metal, a sand portion to permit more gradual cooling of the metal adjacent thereto, and an intermediate zone composed of continuations of the metallic and sand portions of the mold in juxtaposition, and both exposed to contact with the incoming molten metal, and arranged to decrease the rate of cooling of the adjacent metal of the casting from the chill to the sand part of the mold.

2. A mold for producing castings, comprising a metallic portion to chill the contained metal, a sand portion to permit more gradual cooling of the metal adjacent thereto, and an intermediate zone composed of alternating portions of sand and metal.

3. A mold for producing castings, comprising a metallic portion to chill the contained metal, a non-chilling portion to permit more gradual cooling of the casting adjacent there to, and an intermediate portion formed oli.

overlapping and alternately arranged and exposed extensions of the chilling and nonchilling portions of the mold, to prevent sudden variations in the cooling of the intermediate portion of the casting.

' In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

WALTER BRINTON. Witnesses:

BEN. F. ROBBINS, R. D. STRUBLE. 

